Investigation into NSAW excitation and modulation utilizing the grating mask technique

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2024-08-21 DOI:10.1016/j.apacoust.2024.110230

Xiaokang Ma, Bin Lin, Zaiwei Liu, Haiyaun Jia, Yangfan Wan, Yong Li, Wenxing Chen

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引用次数: 0

Abstract

Narrowband surface acoustic wave (NSAW) method is a promising ultrasonic detection technique, with its laser-induced excitation technology offering the advantages of non-contact and flexible regulation. This paper proposes an NSAW excitation and modulation system based on the grating mask method to detect the nonlinear characteristics of the spectra caused by the variation in material surface properties. According to Doyer’s sharp line excitation theory, a strip line source array excitation model formed by superposition principle is established, and the effects of duty ratios of the masks on NSAW spectra amplitude characteristics are interpreted. An NSAW excitation and B-scan experimental system that can realize line source spacing changes is developed, and the effects of cylindrical lens height and masks with different duty ratios on NSAW spectra modulation are studied. The experimental results show that the amplitude ratios (the ratio of the double frequency amplitude to the second harmonic amplitude) are consistent with the results of the Doyer superimposed strip line source array excitation model in which the excitation light source energy is evenly distributed. The second-order nonlinear coefficients extracted from the experimental spectra can effectively characterize the surface properties of 6061 aluminum alloy at different annealing temperatures.

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利用光栅掩模技术研究非屏蔽水波的激发和调制

窄带表面声波（NSAW）方法是一种前景广阔的超声波检测技术，其激光诱导激励技术具有非接触、调节灵活等优点。本文提出了一种基于光栅掩膜法的 NSAW 激发和调制系统，以检测材料表面特性变化引起的光谱非线性特性。根据 Doyer 的锐线激励理论，建立了叠加原理形成的带状线源阵列激励模型，并解释了掩模占空比对 NSAW 光谱振幅特性的影响。开发了可实现线源间距变化的 NSAW 激发和 B-scan 实验系统，研究了圆柱透镜高度和不同占空比掩模对 NSAW 光谱调制的影响。实验结果表明，振幅比（双频振幅与二次谐波振幅之比）与激励光源能量均匀分布的 Doyer 叠加带状线源阵列激励模型的结果一致。从实验光谱中提取的二阶非线性系数可有效表征 6061 铝合金在不同退火温度下的表面特性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

期刊介绍： Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.